Rock-drilling machine or engine.



PATENTED MAY 26 v No. 888,497.

H. HELLMAN & L. 0, BA'YLES; ROCK DRILLING MACHINE 0R ENGINE.

APPLICATION FILED JULY 12.1905.

\M .E w x UNITED STATES PATENT OFFICE;

HENRY HELLMAN-AND LEWIS CONDIGT BAYLES, OE JOHANNESBURG, TIRA'NSYAAL.

ROCK-DRILLING- MACHINE on ENGINE.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed July 12, 1905. Serial No. 269,406.

Machines or Engines, of whichthe-following.

is a specification.

This invention relates to rock or like, drill- LO ing or boring machines or engines actuated by means of compressed air or other ex ansive gaseous fluid, and has for its-especla object the provision of means for introducing and conducting along the drill steel to. the

cutting extremity thereof a quantity of the actuating fluid and water. f

Figure 1 is an elevation of the complete machine, showing in section the front portion of 'the power cylinder, the impact piece,

the swivel and the drill steel. Fig. 2' is a transverse section on line y-z Fig. 1. Fig.

3 is a transverse section on line acz, Fig. 1.

Fig. 4 is a transverse section on line :z1 y

FigJ-l. Fig. 5 isaview of the swivel detached and shown open. Fig. 6 is a longitudinal section ofthe front portion of the power cylinder and protecting casing, showing a modified arrangement for supporting the drill shank in the forward end of the power cylinder ;'''and' Fig. 7 is an elevation of the shank end of the-drill steel, showing a modified construction. f

1 designates .a hollow cylindrical protect:

ing casing and 2 the ower cylinder which is slidingly and rotative y mounted in said cascla imped the sleeve or band 3, which is shown constructed with the cone 4 for mounting the apparatus in an ordinar column or other suitable support. The s eeve 3 is split and formed, with the, lugs 5 between which'is placed a bolt fi-which serves for drawing the two lugs 5 together to tighten the sleeve 3 round the casing 1. j The casing 1 is constructed with an inlet port .7 at or inproximity to the rear end, whichserves for connecting an ordinary tlli'OttlGfVfiilYQ through which the compressed air or other actuating fluidis admitted to the rear endoffthefcasing 5c 1. 'The :casing" 1' is also construe-tied at its forward end with holes 8 whichi serveas ex-'- I haust ports for the'fiuid"e'xhaus ting intothe I casing 'thepower cylinder 12..

.or end piece may be fitted on or in the end of the shank of the dri or hit.

Round the protecting casing 1 is 'mediately transmitted fromthe impact piece .10 to-the shank of the drill steel 16.

' The casing 1 is shown constructed of slightly smaller diameter at the forward end to make a sliding fit with the exterior ofthe power cylinder 2. Instead of the construction shown it will be evident that a bush, cap

the casing to form a bearing for the forward .end of the power cylinder 2. The power cylinder 2 is coiinterbored or madeqof somewhat larger diameter at "the forward end wherein .is located the impact piece 10, which receives, and transmitsthe impacts of the power piston or percussive reci rooati'ng member 11 to The counter-' bore 12 forms with the bore..l3 in which the. power piston 11 reciprocates, an abutment or shoulder which limits therearward move-- ment of the impactpiece l0. The counterbore 12 at the forward'end is made taper and I into it is fitted .a ta-per bush 14., which is made with a squarefor pol onal parallel bore 15see Fig.3. The. dri l steel 16, is at its forwardextremity constructedwith or fashioned into any ordinary and suitable. form of drill or hit, as a, chisel bit or star bit, and at its'rear end or shank is-made of square or polygonal section to correspond tov 80- the bore .15 ofthe bush 14, in which it is loosely positioned. This construction in-,

sures the synchronous rotation of the bit 16 with the power cylinder 2 while allowing the bit 16 to move longitudinally of the power cylinder 2 within certain limits. The inner end of the shank 17 abuts the forward end of the impact piece 10 in the working of the machine, so that the repeated impactsof the percussive reciprocating member 11 are. im-

The impact piece 10 is shown constructed with a central longitudinal hole orv port 18 communicating at the rear end with the interior of the power cylinder 2 alongwhic'h a uantity of the actuating fluid may ass from the forward end of the power cy inder 2. The drill steel 16 is also provided with a'lon gitudinal holeor port 19 which coincides with the hole 18 in the impact piece 10. The aii'or fluid passing from the power cylinder 2 throughltl e im act piece 10 flows along the I hole -1 9; m 'the dI'l l steel 16 andescapes at or in proximity to the cuttingextremity of the dril sure from the tank 34 up the hose p The drill steel 16 is constructed with an annular enlargement or collar 20, and with a port (or ports) 21 in said collar communicating with the longitudinal hole 19. The port or ports 21 is or are preferably angularly disposed inrelation to the longitudinal hole 19 and in a forward direction. Arranged round the collar 20 is a detachable swivel or swivel piece 22 (see Figs. 1, 4 and 5). The swivel is constructed of the two parts 23, 24., hinged together at 25. The two parts are connected to secure the swivel 22 round the collar 20, by means of a ferrule or. nut, 26 Which is carried by the one part 23 and slides up over the end of the other part 24 as seenin Fig. 4. A projecting pin 27, see Fig. 4, fixed in the part 23 works in a groove 28 in the inside of the ferrule 26. When the ferrule 26 is round the two parts 23, 24, or in the. position in which it is shown in Fig. 4, it is retained in that position by rotating it part of a revolution to place the outer extremity of the pin 27 in a recess at. one side of the groove 28. This provides a very ready means for clamping the swivel 22 in position on the drill steel 16. The swivel 22 is recessed on the inside to receive and fit the collar 20 and to form an annular space 29 round the collar; with this space 29 the port (or ports) 21 in the collar 20 communicates. The part 23 of the swivel is constructed with an extension 30 which forms a stem to which the hose or other-flexible pipe 31 is fixed by means of the hose clamp or other suitable device 32. Through the extension 30 is formed a hole 33 leading into the annular space 29. round the collar '20.. The other end of the hose pipe 31 is placed in a tank 34 containing water, or in communication with any other convenient source of water supply.

.When the machine 1s in operation, as previously explained a quantity of the actuating fluid passes through the hole 18 in the impact piece 10 and from the latter along the hole 19 in the drill steel 16 to the cutting end of the bit. This fluid in its passage over the ort 21, exhausts the air from said port and om the annular space 29, hole 33 in the swivel and hose pipe 31, and by tending to create a vacuum therein draws the water or allows it to be forced by atmospheric pres- 'pe 31 and through the hole 19 along whic it passes with the actuating fluid to the cuttin end of the drill.- The water thus conducte to the bottom of the hole serves to prevent the formation of dust, and the fluid, which serves as the medium for conveying said water, by causing the water to impinge with some force at the bottom of the hole, effectually ejects the cuttings, and by preventing their accumulation at the bottom of the hole'obviates the sticking of the bit from this cause. By using a quantity of the actuating fluid in this manner we find that a very much rotatable power cylin smaller volume of water is .required to eject the cuttings than would be the case were water under ressure used alone.

In Fig. 6 ii tion of thearrangement just described, the impact piece as a separate 'member is dispensed with. forward end is constructed with a taper hole 12 in which is fitted the bush 14 formed with a hole of square orolygonal section. Between the bottom of tlie taper hole 12 and the bore 13 of the cylinder 2 is formed a hole 13 somewhat smaller in diameter than the bore 13. This hole 13 places the bottom of the taper hole 12* in communication with the forward end of the cylinder 2. The inner end 17 of the drill steel 16 is made approximately of the same external diameter as the hole 13 in which it fits, and beyond which it projects for a short distance into the bore 13 of the cylinder 2 so that it receives direct the im acts of the reciprocating percussive mem er 11. The steel 16 is constructed with the longitudinal hole 19 and with the collar or annular enlargement 20 in which is formed the angular or forwardly inclined hole 21 communicating with the longitudinal hole 19. The water swivel 22 may be secured round the collar 20 in the same manner as that previously described.

In Fig. 7, showing a modification of the construction of the drill steel 16 shown in Fig. 6, 17 is the inner end which projects into-the bore of the cylinder 2 and receives the impacts of the percussive reciprocating member 11; 17 is the art of square or polygonal section which fits into the polygonal hole 15 at the forward end of the ower cylinder 2, and 19 is the hole formed ongitudinally of the steel 16 along which the actuating fluid passes from the power cylin der. In the steel and in advance of the part 17 of polygonal section is formed a recess 20 fromwhich extends the angular andforwardly inclined port 21 which forms the water duct communicating with the longitudinal hole 19. The water-swivel 22 is located in the recess20 round the steel 16' so that the water may pass from between said swivel and the recess 20* along the port 21 .to the longitudinal hole 19.

What we claim as our invention and desire to protect by Letters Patent is:

1, In a rock-drillin machine or engine, a rotatable power cylin er, a drill steel slidably and non-rotatably held at the forward end of said power. cylinder and. having a passage extending longitudinally of said steel and communicating with the circumference 0,6 said steel, a swivel piece loosely surrounding said steel and in communication with the hole at the circumference thereof, and means for conducting liquid to said swivel piece.

, 2. Ina rock-drilling machine or engine, a er, a drill steel slidably lustrative ofa slight modifica- The power cylinder 2 at the and non-rotetably held at the forward end of said power cylinder and having a passage extending longitudinally of said steel and communicating with the circumference of said steel and with the interior of the power cylinder, a swivel piece loosely surrounding said steel and in communication with the hole at the circumference thereof, and means for conducting liquid to said swivel piece.

HENRY HELLMAN LEWIS (JONDICT BAYLES.

WVitnesses:

CHAs. OVENDALE R. OVENDnLE. 

